birthday suit

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From the lack of clothes worn when one is born.


birthday suit ‎(plural birthday suits)

  1. (idiomatic, often humorous) Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing.
    George embarrassed his aunt by answering the door in his birthday suit.

Usage notes[edit]

  • Usually used in the phrase “in one’s birthday suit”, but sometimes seen alone; for example, as in “Guess what she was wearing? Her birthday suit!”